lab-3 251051 Birukov

README.md

@@ -29,7 +29,7 @@ To start javascript assignments please follow the next steps:
   git commit -m "Update the links"
   git push origin master
 ```
-* Open https://github.com/rolling-scopes-school/js-assignments and test the build icon. Now it will run all tests and update status once you push changes to github. Keep this icon green!
+* Open https://github.com/birukov01/js-assignments and test the build icon. Now it will run all tests and update status once you push changes to github. Keep this icon green!
 
 
 ### How to setup work environment

task/01-strings-tasks.js

@@ -22,7 +22,7 @@
  *   '',  'bb'  => 'bb'
  */
 function concatenateStrings(value1, value2) {
-    throw new Error('Not implemented');
+    return value1 + value2;
 }
 
 
@@ -38,7 +38,7 @@ function concatenateStrings(value1, value2) {
  *   ''      => 0
  */
 function getStringLength(value) {
-    throw new Error('Not implemented');
+    return value.length;
 }
 
 /**
@@ -55,7 +55,7 @@ function getStringLength(value) {
  *   'Chuck','Norris'  => 'Hello, Chuck Norris!'
  */
 function getStringFromTemplate(firstName, lastName) {
-    throw new Error('Not implemented');
+    return `Hello, ${firstName} ${lastName}!`;
 }
 
 /**
@@ -69,7 +69,10 @@ function getStringFromTemplate(firstName, lastName) {
  *   'Hello, Chuck Norris!' => 'Chuck Norris'
  */
 function extractNameFromTemplate(value) {
-    throw new Error('Not implemented');
+    let str = '';
+	let i = value.indexOf(' ') + 1;
+	for (; value[i] != '!'; i++) str += value[i];
+	return str;
 }
 
 
@@ -84,7 +87,7 @@ function extractNameFromTemplate(value) {
  *   'cat'       => 'c'
  */
 function getFirstChar(value) {
-    throw new Error('Not implemented');
+    return value[0];
 }
 
 /**
@@ -99,7 +102,17 @@ function getFirstChar(value) {
  *   '\tHello, World! ' => 'Hello, World!'
  */
 function removeLeadingAndTrailingWhitespaces(value) {
-    throw new Error('Not implemented');
+    let str = '';
+    let l = 0;
+	let t = value.length - 1;
+	while (value[l] == ' ' || value[l] == '\t') l++;
+	while (value[t] == ' ' || value[t] == '\t') t--;
+	while (l <= t)
+	{
+		str += value[l];
+		l++;
+	}
+	return str;
 }
 
 /**
@@ -114,7 +127,9 @@ function removeLeadingAndTrailingWhitespaces(value) {
  *   'cat', 3 => 'catcatcat'
  */
 function repeatString(value, count) {
-    throw new Error('Not implemented');
+    let str = '';
+	for (let i = 0; i < count; i++) str += value;
+	return str;
 }
 
 /**
@@ -130,7 +145,18 @@ function repeatString(value, count) {
  *   'ABABAB','BA' => 'ABAB'
  */
 function removeFirstOccurrences(str, value) {
-    throw new Error('Not implemented');
+    let strN = '';
+	let posV = str.indexOf(value);
+	for (let i = 0; i < str.length; i++)
+	{
+		if (i == posV)
+		{
+			i += value.length;
+			if (str[posV - 1] == ' ' && str[i] == ' ') i++;
+		}
+		strN += str[i];
+	}
+	return strN;
 }
 
 /**
@@ -145,7 +171,11 @@ function removeFirstOccurrences(str, value) {
  *   '<a>' => 'a'
  */
 function unbracketTag(str) {
-    throw new Error('Not implemented');
+    let strN = '';
+	for (let i = 0; i < str.length; i++)
+		if (str[i] != '<' && str[i] != '>')
+			strN += str[i];
+	return strN;
 }
 
 
@@ -160,7 +190,7 @@ function unbracketTag(str) {
  *  'abcdefghijklmnopqrstuvwxyz' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
  */
 function convertToUpperCase(str) {
-    throw new Error('Not implemented');
+    return str.toUpperCase();
 }
 
 /**
@@ -174,7 +204,21 @@ function convertToUpperCase(str) {
  *   '[email protected]' => ['[email protected]']
  */
 function extractEmails(str) {
-    throw new Error('Not implemented');
+    let arr = [];
+	let iS = 0;
+	let iA = 0;
+	while (iS < str.length)
+	{
+		if (str[iS] == ';') iS++;
+		arr[iA] = '';
+		while (str[iS] != ';' && iS < str.length)
+		{
+			arr[iA] += str[iS];
+			iS++;
+		}
+		iA++;
+	}
+    return arr;
 }
 
 /**
@@ -201,7 +245,20 @@ function extractEmails(str) {
  *
  */
 function getRectangleString(width, height) {
-    throw new Error('Not implemented');
+    let str = '';
+    str += ' ┌';
+	for (let i = 0; i < width - 2; i++) str += '─';
+	str += '┐\n';
+	for (let i = 0; i < height - 2; i++)
+	{
+		str += ' │';
+		for (let i = 0; i < width - 2; i++) str += ' ';
+		str += '│\n';
+	}
+	str += ' └';
+	for (let i = 0; i < width - 2; i++) str += '─';
+	str += '┘\n';
+	return str;
 }
 
 
@@ -221,7 +278,21 @@ function getRectangleString(width, height) {
  *
  */
 function encodeToRot13(str) {
-    throw new Error('Not implemented');
+    let strN = '';
+	let a = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz';
+	let p;
+	for (let i = 0; i < str.length; i++)
+	{
+		p = a.indexOf(str[i]);
+		if (p == -1) strN += str[i];
+		else
+		{
+			p += 26;
+			if (p > 51) p -= 52;
+			strN += a[p];
+		}
+	}
+	return strN;
 }
 
 /**
@@ -238,7 +309,7 @@ function encodeToRot13(str) {
  *   isString(new String('test')) => true
  */
 function isString(value) {
-    throw new Error('Not implemented');
+    return Object.prototype.toString.call(value) === "[object String]";
 }
 
 
@@ -267,7 +338,21 @@ function isString(value) {
  *   'K♠' => 51
  */
 function getCardId(value) {
-    throw new Error('Not implemented');
+    let str1 = 'A23456789dJQK';
+	let str2 = '♣♦♥♠';
+	let p1;
+	let p2;
+	if (value[1] == '0')
+	{
+		p1 = str1.indexOf('d');
+		p2 = str2.indexOf(value[2]);
+	}
+    else
+	{
+		p1 = str1.indexOf(value[0]);
+		p2 = str2.indexOf(value[1]);
+	}
+	return p2 * 13 + p1;
 }
 
 

task/02-numbers-tasks.js

@@ -22,7 +22,7 @@
  *   5, 5  => 25
  */
 function getRectangleArea(width, height) {
-    throw new Error('Not implemented');
+    return width*height;
 }
 
 
@@ -38,7 +38,7 @@ function getRectangleArea(width, height) {
  *   0    => 0
  */
 function getCicleCircumference(radius) {
-    throw new Error('Not implemented');
+    return 2 * Math.PI * radius;
 }
 
 /**
@@ -54,7 +54,7 @@ function getCicleCircumference(radius) {
  *  -3, 3  => 0
  */
 function getAverage(value1, value2) {
-    throw new Error('Not implemented');
+    return (value1 + value2) / 2;
 }
 
 /**
@@ -73,7 +73,7 @@ function getAverage(value1, value2) {
  *   (-5,0) (10,-10) => 18.027756377319946
  */
 function getDistanceBetweenPoints(x1, y1, x2, y2) {
-    throw new Error('Not implemented');
+    return Math.pow(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2), 0.5);
 }
 
 /**
@@ -89,7 +89,7 @@ function getDistanceBetweenPoints(x1, y1, x2, y2) {
  *   5*x = 0         => 0
  */
 function getLinearEquationRoot(a, b) {
-    throw new Error('Not implemented');
+    return -b / a;
 }
 
 
@@ -111,7 +111,9 @@ function getLinearEquationRoot(a, b) {
  *   (0,1) (1,2)     => 0
  */
 function getAngleBetweenVectors(x1, y1, x2, y2) {
-    throw new Error('Not implemented');
+    var angle = Math.atan2(y2, x2) - Math.atan2(y1, x1)
+    if (angle < 0) angle += 2 * Math.PI;
+	return angle
 }
 
 /**
@@ -127,7 +129,7 @@ function getAngleBetweenVectors(x1, y1, x2, y2) {
  *     0     => 0
  */
 function getLastDigit(value) {
-    throw new Error('Not implemented');
+    return value%10;
 }
 
 
@@ -143,7 +145,7 @@ function getLastDigit(value) {
  * '-525.5'     => -525.5
  */
 function parseNumberFromString(value) {
-    throw new Error('Not implemented');
+    return Number(value);
 }
 
 /**
@@ -160,7 +162,7 @@ function parseNumberFromString(value) {
  *   1,2,3   => 3.741657386773941
  */
 function getParallelipidedDiagonal(a,b,c) {
-    throw new Error('Not implemented');
+    return Math.pow(Math.pow(a,2) + Math.pow(b,2) + Math.pow(c,2), 0.5);
 }
 
 /**
@@ -181,7 +183,9 @@ function getParallelipidedDiagonal(a,b,c) {
  *   1678, 3  => 2000
  */
 function roundToPowerOfTen(num, pow) {
-    throw new Error('Not implemented');
+    let a = Math.pow(10, pow);
+    let b = Math.round(num / a);
+    return b*a;
 }
 
 /**
@@ -202,7 +206,9 @@ function roundToPowerOfTen(num, pow) {
  *   17 => true
  */
 function isPrime(n) {
-    throw new Error('Not implemented');
+    for(let i = 2; i < n / 2 + 1; i++)
+		if (n % i == 0) return false;
+    return true;
 }
 
 /**
@@ -221,7 +227,9 @@ function isPrime(n) {
  *   toNumber(new Number(42), 0) => 42
  */
 function toNumber(value, def) {
-    throw new Error('Not implemented');
+    const num = Number(value);
+    if(isNaN(num)) return def;
+    else return num;
 }
 
 module.exports = {

task/03-date-tasks.js

@@ -22,7 +22,7 @@
  *    'Sun, 17 May 1998 03:00:00 GMT+01' => Date()
  */
 function parseDataFromRfc2822(value) {
-   throw new Error('Not implemented');
+    return Date.parse(value);
 }
 
 /**
@@ -37,7 +37,7 @@ function parseDataFromRfc2822(value) {
  *    '2016-01-19T08:07:37Z' => Date()
  */
 function parseDataFromIso8601(value) {
-   throw new Error('Not implemented');
+    return Date.parse(value);
 }
 
 
@@ -56,7 +56,8 @@ function parseDataFromIso8601(value) {
  *    Date(2015,1,1)    => false
  */
 function isLeapYear(date) {
-   throw new Error('Not implemented');
+	let year = date.getFullYear();
+    return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
 }
 
 
@@ -76,7 +77,7 @@ function isLeapYear(date) {
  *    Date(2000,1,1,10,0,0),  Date(2000,1,1,15,20,10,453)   => "05:20:10.453"
  */
 function timeSpanToString(startDate, endDate) {
-   throw new Error('Not implemented');
+    return (new Date(endDate - startDate)).toISOString().slice(11, -1);
 }
 
 
@@ -94,7 +95,11 @@ function timeSpanToString(startDate, endDate) {
  *    Date.UTC(2016,3,5,21, 0) => Math.PI/2
  */
 function angleBetweenClockHands(date) {
-    throw new Error('Not implemented');
+    const hoursArrow = 0.5 * (60 * (date.getUTCHours() % 12) + date.getUTCMinutes());
+    const minutesArrow = 6 * date.getUTCMinutes();
+    let angle = Math.abs(hoursArrow - minutesArrow);
+    if (angle > 180) angle = 360 - angle;
+    return (angle * Math.PI / 180);
 }